xii SYNOPSIS OF GENERA. 



parent tube tunis upwards and ceases growth, and the young cells continue 

 the growth of the colony. Tubes without pores, and cominonly without 

 diaphragms ; sometimes with radiating lamella}. 

 Examples: Aulopora Schoharia, pi. ii, figs. 1-6. 

 Aulopora tubtda, pi. ii, figs. 7, 8. 



Vermipora, Hall (Twenty-sixth Ann. Rept. N. Y. State Mus. Nat. Hist., p. 

 109. 1874. [Type, Vermipora serpuloides. Hall.] 



Corallum ramose, consisting of continuous serpula-like cell tubes, without 

 intercellular tissue, arising from the center of the branch, and increasing by 

 lateral gemmation. No transverse diaphragms or mural pores have been 

 observed in the typical species of the geims. 



Example : Vermipora serpuloides, pi. ii, figs. 24-31. 



Striatopora, Hall (Pal. N. Y., vol. ii, p. 156. 1852). 



[Type, Striatopora flexuosa, Hall.] 



Corallum ramose, composed of thick walled tubes arising from the center of 

 the branch, turning outwards to the surface and opening in an expanded aper- 

 ture. The interior of the tubes is marked by strong longitudinal stria? or 

 ridges, and numerous mural pores connecting the cells; diaphragms often 

 present. 



This genus is closely related to Cladopora, from which it is distinguished 

 principally by the greater development of the longitudinal striae within the 

 cell tubes, and more frequent mural pores. 



Example: Striatopora Issa, pi. iii, figs. 14, 15. 



Michelinia, DeKoninck (De.sc. An. Foss. Carb. Belg., p. 29. 1842). 



[Type, Manon favosum, Goldfuss.] 



Compound hemispherical corals, composed of elongate conical tubes, which 

 are usually in contact for their entire length, and connected by mural pores. 

 Tubes strongly striated longitudin.ally, and, in the larger species, intersected by 

 numerous coarsely vesiculose diaphragms. 



The Lower Helderberg form, referred to this genus, is not a characteristic 

 species, on account of the absence of diaphragms and the few short campanulate 

 cell tubes composing the corallum. 



Example : Michelinia lenticularis, pi. iii, figs. 1, 2, 3, 5. 



